A common claim that the word derives from Antoni Gaudí, designer of Barcelona's Sagrada Família Basilica, is not supported by evidence (the word was in use at least half a century before Gaudí was born).

The rooms were lofty and handsome, and their furniture suitable to the fortune of its proprietor; but Elizabeth saw, with admiration of his taste, that it was neither gaudy nor uselessly fine; with less of splendour, and more real elegance, than the furniture of Rosings.

1887, Homer Greene, Burnham Breaker

A large gaudy, flowing cravat, and an ill-used silk hat, set well back on the wearer's head, completed this somewhat noticeable costume.